/**
 * Encrypt a plaintext string. Returns "iv:ciphertext:authTag" (hex-encoded).
 */
export declare function encrypt(plaintext: string): string;
/**
 * Decrypt a value produced by encrypt(). Expects "iv:ciphertext:authTag" (hex-encoded).
 * Throws on tampered/corrupt data or wrong key.
 */
export declare function decrypt(encryptedValue: string): string;
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